A kind of marine low magnetic steel and preparation method thereof

Abstract

The invention discloses low magnetic steel for a vessel and a preparation method thereof. The low magnetic steel for the vessel comprises chemical components of, by mass, 1.22%-1.53%of C, 0.17%-0.28%of Si, 8.9%-9.8% of Mn, less than or equal to 0.005% of P, less than or equal to 0.002% of S, 0.11%-0.34% of Ni, 0. 01%-0.18% of Coand the balance Fe and inevitable impurities. During preparation, themass ratios of the chemical components are adjusted in a molten iron tank first, then molten iron desulphurization, converter furnace dephosphorization and alloying, refining desulfurization, blowingAR smelting outside a furnace and RH vacuum treatment are carried out, and finally rolling, watering and quick cooling are carried out. The low magnetic steel for the vessel is simple in chemical component and in production process, low in magnetic conductivity, effective in magnetic shielding, and suitable for manufacturing electrical magnetic shielding structural parts for the vessel, and a "green" healthy vessel is built.

Description

technical field [0001] The invention relates to the technical field of alloy structural steel manufacturing, in particular to a marine low magnetic field and a preparation method thereof. Background technique [0002] Due to the small space in the hull and the large number of electromechanical and electrical equipment, the magnetic field and magnetic force generated will have invisible damage to the crew. Unlike land, the crew's work and production places are very close to the electrical equipment, and they are exposed to the magnetic field. Noise, single diet, etc., the crew are prone to "crew syndrome" such as moodiness, inability to concentrate, and memory loss. At present, ordinary inland river ships and ordinary ocean-going civilian sea-going ships do not use low-magnet steel to shield electrical equipment, so that the entire hull is in a magnetic field, which is easy to cause abnormal behavior of the crew. In order to create a "green" ship, one of the important measur...

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Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that the austenite structure of the low magnetic steel produced by the prior art belongs to the metastable austenite, and it is easy to transform the metastable austenite into martensite during the processing or with the extension of time. Or ferrite, become easily magnetized material, thereby lose the problem of shielding effect, provide a kind of marine low magnetic steel and its preparation method, the steel plate prepared by the present invention has relative magnetic permeability μ≤1.0001, yield strength≥510MPa, and comprehensive performance is excellent , suitable for the manufacture of marine electrical and magnetic shielding structural parts, to create "green" healthy ships

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